http://www.positioniseverything.net/
“I'm Big John, and here I attempt to describe and demonstrate some of the bugs found in web browsers, and to show advanced CSS methods that work across all browsers.” (Quotation: Big John Design)

Typetester
The Typetester is an online application for comparison of the fonts for the screen. Its primary role is to make web designer’s life easier.

pmob.co.uk raw CSS examples
“Within the tutorials and FAQ you'll find examples of how to create CSS based page layouts, style your documents and organise your code. This site also exposes, then shows you how to fix, many of the bugs and foibles of the most common browsers.
… the three column Demos (still valid today even though they were done 2 years ago) and various examples of how to use css to add content to your site” (Quotation: pmob.co.uk)